Abstract
This paper presents a velocity-sensorless decentralized tension control scheme without true machine parameter dependence for roll-to-roll printing machines. Both the nonlinear nature and parameter uncertainties are taken into account the development task. As the first merit, the proposed observer eliminates the requirement of velocity feedback without any plant information even the nominal parameters. The introduction of the active-damping with the estimated state reduces the closed-loop system order to 1 by the pole-zero cancellation using the specified feedback gains. Finally, the disturbance observer (DOB) replaces the regulation error integrators with the closed-loop robustness improvement against the high-frequency disturbances. The MATLAB/Simulink-based simulations validate the effectiveness of the proposed decentralized scheme.
Highlights
Roll-to-roll (R2R) systems have been widely adopted for industrial manufacturing processes
The previous results including the centralized and decentralized scheme suffered from parameter dependence of control and observers, at least partially, which is the problem to be solved in this study
This study focuses on devising the tension and web velocity control scheme for the 2-span machine for simplicity since the result for the 2-span system can be trivially expanded to this general case
Summary
Roll-to-roll (R2R) systems have been widely adopted for industrial manufacturing processes (e.g., in printing, drying, and coating). The previous results including the centralized and decentralized scheme suffered from parameter dependence of control and observers, at least partially, which is the problem to be solved in this study. An advanced velocity-sensorless nonlinear tension control law under a decentralized structure without the requirement of full-state feedback and true system parameter values is presented. (c) A disturbance observer (DOB) is incorporated as a replacement for regulation error integral actions in the PD-type tension and proportional (P) web velocity controller to enhance the closed-loop robustness and to ensure the two beneficial properties of performance recovery and steady-state error rejection. This study focuses on devising the tension and web velocity control scheme for the 2-span machine for simplicity since the result for the 2-span system can be trivially expanded to this general case.
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